CVE-2021-4074: I-Plugins Whmcs Bridge

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

The WHMCS Bridge WordPress plugin is vulnerable to Stored Cross-Site Scripting via the cc_whmcs_bridge_url parameter found in the ~/whmcs-bridge/bridge_cp.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 6.1. Due to missing authorization checks on the cc_whmcs_bridge_add_admin function, low-level authenticated users such as subscribers can exploit this vulnerability.

Affected products

• I-Plugins Whmcs Bridge: up to and including 6.1

Published 2022-01-18. Last modified 2026-06-17.